Aggregating extended preferences

An important objection to preference-satisfaction theories of well-being is that they cannot make sense of interpersonal comparisons. A tradition dating back to Harsanyi (J Political Econ 61(5): 434, 1953) attempts to solve this problem by appeal to people's so-called extended preferences. This paper presents a new problem for the extended preferences program, related to Arrow's celebrated impossibility theorem. We consider three ways inwhich the extended-preference theoristmight avoid this problem, and recommend that she pursue one: developing aggregation rules (for extended preferences) that violate Arrow's Independence of Irrelevant Alternatives condition.